Special Issues
Table of Content

CFD Modeling and Multiphase Flows

Submission Deadline: 01 September 2019 (closed) View: 156

Guest Editors

Lennon Ó Náraigh, University College Dublin, Ireland.
Prashant Valluri, University of Edinburgh, UK.

Summary

The symposium is focused on the computational modelling of instabilities and turbulence in separated two phase flow. As such, contributions from researchers working on such flows are invited, including but not limited to the following aspects:
1) Recent algorithmic developments in level-set, volume-of-fluid, Diffuse-Interface, Lattice-Boltzmann, Front Tracking; 
2) Recent developments in the understanding of the instabilities in such fluids, e.g. linear and nonlinear instability; 
3) High-performance computing aspects, including possible direction of research in the context of exascal computing;
4) Postprocessing and model validation, including Statistical Learning and Uncertainty Quantification; 
5) Input from experimentalists working in the area; 
6) Industrial and technical applications of two-phase flows.

Further contributions from multiphase flow broadly are also welcomed, especially if they can provide insight in the above main topical areas. 


Keywords

computational fluid dynamics, industrial and technical application of two-phase flows

Published Papers


  • Open Access

    ARTICLE

    Simulation of Moving Bed Erosion Based on the Weakly Compressible Smoothed Particle Hydrodynamics-Discrete Element Coupling Method

    Qingyun Zeng, Mingxin Zheng, Dan Huang
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.12, pp. 2981-3005, 2023, DOI:10.32604/fdmp.2023.029427
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract A complex interface exists between water flow and solid particles during hydraulic soil erosion. In this study, the particle discrete element method (DEM) has been used to simulate the hydraulic erosion of a granular soil under moving bed conditions and surrounding terrain changes. Moreover, the weakly compressible smoothed particle hydrodynamics (WCSPH) approach has been exploited to simulate the instability process of the free surface fluid and its propagation characteristics at the solid–liquid interface. The influence of a suspended medium on the water flow dynamics has been characterized using the mixed viscosity concept accounting for the More >

    Graphic Abstract

    Simulation of Moving Bed Erosion Based on the Weakly Compressible Smoothed Particle Hydrodynamics-Discrete Element Coupling Method

  • Open Access

    ARTICLE

    Influence of Spray Gun Position and Orientation on Liquid Film Development along a Cylindrical Surface

    Jiuxuan Liu, Yong Zeng, Xueya Zhao, Hongbo Chen, Bin Yan, Qian Lu
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.10, pp. 2499-2518, 2023, DOI:10.32604/fdmp.2023.028413
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract

    A method combining computational fluid dynamics (CFD) and an analytical approach is proposed to develop a prediction model for the variable thickness of the spray-induced liquid film along the surface of a cylindrical workpiece. The numerical method relies on an Eulerian-Eulerian technique. Different cylinder diameters and positions and inclinations of the spray gun are considered and useful correlations for the thickness of the liquid film and its distribution are determined using various data fitting algorithms. Finally, the reliability of the proposed method is verified by means of experimental tests where the robot posture is changed. The

    More >

    Graphic Abstract

    Influence of Spray Gun Position and Orientation on Liquid Film Development along a Cylindrical Surface

  • Open Access

    ARTICLE

    Simulation and Optimization of the Fluid Solidification Process in Brazed Plate Heat Exchangers

    Weiting Jiang, Lei Zhao, Chongyang Wang, Tingni He, Weiguo Pan
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.10, pp. 2597-2611, 2023, DOI:10.32604/fdmp.2023.027504
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract When a brazed plate heat exchanger is used as an evaporator, the working mass in the channel may undergo solidification, thereby hindering the refrigeration cycle. In this study the liquid solidification process and its optimization in a brazed plate heat exchanger are investigated numerically for different inlet velocities; moreover, different levels of corrugation are considered. The results indicate that solidification first occurs around the contacts, followed by the area behind the contacts. It is also shown that dead flow zones exist in the sharp areas and such areas are prone to liquid solidification. After optimization, More >

  • Open Access

    ARTICLE

    Optimized Design of H-Type Vertical Axis Wind Airfoil at Multiple Angles of Attack

    Chunyan Zhang, Shuaishuai Wang, Yinhu Qiao, Zhiqiang Zhang
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.10, pp. 2661-2679, 2023, DOI:10.32604/fdmp.2023.028059
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract Numerical simulations are conducted to improve the energy acquisition efficiency of H-type vertical axis wind turbines through the optimization of the related blade airfoil aerodynamic performance. The Bézier curve is initially used to fit the curve profile of a NACA2412 airfoil, and the moving asymptote algorithm is then exploited to optimize the design of the considered H-type vertical-axis wind-turbine blade airfoil for a certain attack angle. The results show that the maximum lift coefficient of the optimized airfoil is 8.33% higher than that of the original airfoil. The maximum lift-to-drag ratio of the optimized airfoil More >

    Graphic Abstract

    Optimized Design of H-Type Vertical Axis Wind Airfoil at Multiple Angles of Attack

  • Open Access

    ARTICLE

    Numerical Fluid Flow Modelling in Multiple Fractured Porous Reservoirs

    Yatin Suri, Sheikh Zahidul Islam, Kirsten Stephen, Cameron Donald, Michael Thompson, Mohamad Ghazi Droubi, Mamdud Hossain
    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 245-266, 2020, DOI:10.32604/fdmp.2020.06505
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract This paper compares the fluid flow phenomena occurring within a fractured reservoir for three different fracture models using computational fluid dynamics. The effect of the fracture-matrix interface condition is studied on the pressure and velocity distribution. The fracture models were compared based on the variation in pressure and permeability conditions. The model was developed for isotropic and anisotropic permeability conditions. The results suggest that the fracture aperture can have a drastic effect on fluid flow. The porous fracture-matrix interface condition produces more realistic transport of fluids. By increasing the permeability in the isotropic porous matrix, More >

  • Open Access

    ARTICLE

    Heat and Mass Transfer Characteristics of Alkali Metals in a Combined Wick of High-Temperature Heat Pipe

    Ping Yu, Chuanhui Huang, Lei Liu, Huafeng Guo, Chengqiang Liu
    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 267-280, 2020, DOI:10.32604/fdmp.2020.06528
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract To study the heat and mass transfer characteristics of alkali metals in a combined porous wick in high-temperature heat pipes, a three-dimensional (3-D) numerical model is constructed by using the finite volume method, Darcy’s theory, and the theory of local thermal equilibrium. The research finds that the pressure drop of fluids flowing through a combined porous wick exhibits an increasing trend with increasing flow velocity at the inlet and with decreasing permeability of the porous media; a combined porous wick of lower porosity and permeability and larger fluid velocity at the inlet is found to More >

  • Open Access

    ARTICLE

    Numerical Simulation of Fluid and Heat Transfer in a Biological Tissue Using an Immersed Boundary Method Mimicking the Exact Structure of the Microvascular Network

    Yuanliang Tang, Lizhong Mu, Ying He
    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 281-296, 2020, DOI:10.32604/fdmp.2020.06760
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract The aim of this study is to develop a model of fluid and heat transfer in a biological tissue taking into account the exact structure of the related microvascular network, and to analyze the influence of structural changes of such a network induced by diabetes. A cubic region representing local skin tissue is selected as the computational domain, which in turn includes two intravascular and extravascular sub-domains. To save computational resources, the capillary network is reduced to a 1D pipeline model and embedded into the extravascular region. On the basis of the immersed boundary method… More >

  • Open Access

    ARTICLE

    Numerical Modelling of Proppant Transport in Hydraulic Fractures

    Yatin Suri, Sheikh Zahidul Islam, Mamdud Hossain
    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 297-337, 2020, DOI:10.32604/fdmp.2020.08421
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract The distribution of proppant injected in hydraulic fractures significantly affects the fracture conductivity and well performance. The proppant transport in thin fracturing fluid used during hydraulic fracturing in the unconventional reservoirs is considerably different from fracturing fluids in the conventional reservoir due to the very low viscosity and quick deposition of the proppants. This paper presents the development of a threedimensional Computational Fluid Dynamics (CFD) modelling technique for the prediction of proppant-fluid multiphase flow in hydraulic fractures. The proposed model also simulates the fluid leak-off behaviour from the fracture wall. The Euler-Granular and CFD-Discrete Element… More >

  • Open Access

    ARTICLE

    Study on Dynamic Prediction of Two-Phase Pipe Flow in Inclined Wellbore with Middle and High Yield

    Xiaoya Feng, Wei Luo, Yu Lei, Yubin Su, Zhigang Fang
    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 339-358, 2020, DOI:10.32604/fdmp.2020.08564
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract Gas-liquid two-phase flow is ubiquitous in the process of oil and gas exploitation, gathering and transportation. Flow pattern, liquid holdup and pressure drop are important parameters in the process of gas-liquid two-phase flow, which are closely related to the smooth passage of the two-phase fluid in the pipe section. Although Mukherjee, Barnea and others have studied the conventional viscous gas-liquid two-phase flow for a long time at home and abroad, the overall experimental scope is not comprehensive enough and the early experimental conditions are limited. Therefore, there is still a lack of systematic experimental research… More >

  • Open Access

    ARTICLE

    On the Liquid-Vapor Phase-Change Interface Conditions for Numerical Simulation of Violent Separated Flows

    Matthieu Ancellin, Laurent Brosset, Jean-Michel Ghidaglia
    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 359-381, 2020, DOI:10.32604/fdmp.2020.08642
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract Numerous models have been proposed in the literature to include phase change into numerical simulations of two-phase flows. This review paper presents the modeling options that have been taken in order to obtain a model for violent separated flows with application to sloshing wave impacts. A relaxation model based on linear non-equilibrium thermodynamics has been chosen to compute the rate of phase change. The integration in the system of partial differential equations is done through a non-conservative advection term. For each of these modelling choices, some alternative models from the literature are presented and discussed. More >

  • Open Access

    ARTICLE

    Linear and Nonlinear Stability Analysis in Microfluidic Systems

    Lennon Ó Náraigh, Daniel R. Jansen van Vuuren
    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.2, pp. 383-410, 2020, DOI:10.32604/fdmp.2020.09265
    (This article belongs to the Special Issue: CFD Modeling and Multiphase Flows)
    Abstract In this article we use analytical and numerical modeling to describe parallel viscous two-phase flows in microchannels. The focus is on idealized two-dimensional geometries, with a view to validating the various methodologies for future work in three dimensions. In the first instance, we use analytical Orr-Sommerfeld theory to describe the linear instability which governs the formation of small-amplitude waves in such systems. We then compare the results of this analysis with an in-house Computational Fluid Dynamics (CFD) solver called TPLS. Excellent agreement between the theoretical analysis and TPLS is obtained in the regime of small-amplitude More >

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